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    <h3>插入DOM</h3>
    <p id="js">JavaScript</p>
<div id="list">
    <p id="java">Java</p>
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    <p id="python">Python</p>
    <p id="scheme">Scheme</p>

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    <h3>删除DOM</h3>>
    <div id="parent">
        <p>First</p>
        <p>Second</p>
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    <script src="1.js"></script>
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